CN111010213A - An aircraft electrical system communication terminal - Google Patents

An aircraft electrical system communication terminal Download PDF

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CN111010213A
CN111010213A CN201911108097.7A CN201911108097A CN111010213A CN 111010213 A CN111010213 A CN 111010213A CN 201911108097 A CN201911108097 A CN 201911108097A CN 111010213 A CN111010213 A CN 111010213A
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slave
communication
main
circuit
power supply
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CN111010213B (en
Inventor
苏峰
王强
刘志轩
金文�
邝浩欣
徐进
李北国
王洪凯
霍小宁
马瑞
何静
李国昌
宋玮琼
羡慧竹
李蕊
郭帅
韩柳
李冀
夏黄蓉
任昌健
苏晓东
王伟伟
修展
谷静
寇宇
王硕
王小珲
李强
王海洋
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China Academy of Launch Vehicle Technology CALT
Beijing Aerospace Changzheng Aircraft Institute
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China Academy of Launch Vehicle Technology CALT
Beijing Aerospace Changzheng Aircraft Institute
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B3/00Line transmission systems
    • H04B3/54Systems for transmission via power distribution lines

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
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  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
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Abstract

一种飞行器电气系统通信终端,包括一个主节点终端和多个从节点终端,在飞行器电子系统中选择一个电子设备安装主节点终端,在其余电子设备上安装从节点终端,主节点终端和从节点终端能够实现自动组网,每个从节点终端和主节点终端通过28V直流供电线进行通信。本发明实现了基于电力线的数据通信,从而降低了线缆网的复杂度,进而降低了飞行器的重量和体积。

Figure 201911108097

An aircraft electrical system communication terminal, comprising a master node terminal and a plurality of slave node terminals, select one electronic device in the aircraft electronic system to install the master node terminal, and install slave node terminals, master node terminals and slave nodes on the remaining electronic devices The terminal can realize automatic networking, and each slave node terminal and the master node terminal communicate through a 28V DC power supply line. The invention realizes the data communication based on the power line, thereby reducing the complexity of the cable network, thereby reducing the weight and volume of the aircraft.

Figure 201911108097

Description

Aircraft electrical system communication terminal
Technical Field
The invention relates to an aircraft electrical system communication terminal, and belongs to the field of remote measuring systems.
Background
The communication between the electrical devices in the aircraft generally carries out data transmission in a wired mode, and because the electrical devices are more and the communication signal types are complex, a huge cable network between the devices exists in an electrical system, so that the weight and the volume of the aircraft are greatly increased.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and the aircraft electrical system communication terminal is provided to realize data communication based on the power line, so that the complexity of a cable network is reduced, and the weight and the volume of the aircraft are reduced.
The technical solution of the invention is as follows:
the aircraft electrical system communication terminal comprises a master node terminal and a plurality of slave node terminals, wherein one electronic device is selected from an aircraft electronic system and is provided with the master node terminal, the other electronic devices are provided with the slave node terminals, the master node terminal and the slave node terminals can realize automatic networking, and each slave node terminal and the master node terminal are communicated through a 28V direct current power supply line.
Each slave node terminal can be used as a relay communication contact to realize the communication between the remote slave node terminal and the master node terminal.
The main node terminal comprises a main control circuit, a main PLC carrier communication circuit, a main RS422 interface circuit and a main power supply circuit;
a main control circuit: determining a networking white list, and sending a networking instruction to a main PLC carrier communication circuit; controlling the communication frequency band and the transmitting signal gain of the PLC, and simultaneously sending the communication frequency band of the slave node terminal to the main PLC carrier communication circuit; after networking, receiving the carrier data of the slave node terminal sent by the master PLC carrier communication circuit, judging whether the carrier data is sent to the master node terminal, if so, sending the carrier data to master external equipment connected with the master node terminal through a master RS422 interface circuit; receiving the information of the main external equipment forwarded by the main RS422 interface circuit, converting the information into carrier data and sending the carrier data to the main PLC carrier communication circuit;
main PLC carrier communication circuit: is connected with a 28V direct current power supply line; sending the networking instruction to a slave node terminal in a networking white list through a 28V direct current power supply line; transmitting the communication frequency band of the slave node terminal to the slave node terminal through a 28V direct current power supply line; after networking, receiving carrier data sent by the slave node terminal through a 28V direct current power supply line, and sending the carrier data to the main control circuit; if the carrier data is to be sent to other slave node terminals, sending the carrier data to the corresponding slave node terminals through a 28V direct current power supply line; according to the requirement, the carrier data from the main control circuit is sent to the corresponding slave node terminal through a 28V direct current power supply line;
main RS422 interface circuit: the carrier data transmission circuit is connected with the main external equipment, forwards information sent by the main external equipment to the main control circuit and sends the carrier data received by the main control circuit to the main external equipment;
a main power supply circuit: and receiving power supply of a 28V direct current power supply line, performing primary power supply conversion on the power supply line to obtain 12V voltage to supply power to the main PLC carrier communication circuit, and performing secondary power supply conversion on the 12V voltage to obtain 3.3V voltage to supply power to the main PLC carrier communication circuit, the main control circuit and the main RS422 interface circuit.
The communication rate of data transmission between the main control circuit and the main PLC carrier communication circuit can reach 3Mbps at most.
The main control circuit adopts an STM32F103CBT6 chip and designs three communication interfaces, namely an external debugging interface and two UART interfaces; the STM32F103CBT6 chip adopts a Cortex-M3 ARM inner core, and the dominant frequency is 72 MHz; the external debugging interface is connected to the external connector of the product, so that the program upgrading and debugging functions of the main node terminal are realized; the UART1 is connected to the main RS422 interface circuit to realize the serial port communication function with the main external equipment, and the maximum communication speed reaches 2.25 Mb/s; the UART2 is connected to the main PLC carrier communication circuit to realize data transceiving function, and the maximum communication speed reaches 4.5 Mb/s.
The slave node terminal comprises a slave control circuit, a slave PLC carrier communication circuit, a slave RS422 interface circuit and a slave power supply circuit;
slave PLC carrier communication circuit: is connected with a 28V direct current power supply line; receiving a networking instruction through a 28V direct current power supply line to realize network access; receiving the communication frequency band and the information carrier data of the main external equipment sent by the main node terminal through a 28V direct current power supply line, and forwarding the data to a slave control circuit; sending the information carrier data of the slave external equipment to a main node terminal through a 28V direct current power supply line;
the slave control circuit: receiving a communication frequency band sent by a main node terminal, and adjusting the communication frequency band to the communication frequency band sent by the main node terminal; receiving information carrier data of the master external equipment sent by the master node terminal, and forwarding the information carrier data to the slave external equipment connected with the slave node terminal through a slave RS422 interface circuit; receiving the information of the slave external equipment forwarded by the RS422 interface circuit, converting the information into carrier data and sending the carrier data to the slave PLC carrier communication circuit;
from the RS422 interface circuitry: the slave control circuit is connected with the slave external device, forwards the information sent from the external device to the slave control circuit and sends the carrier data received from the control circuit to the slave external device;
from the power supply circuit: the power supply of the 28V direct current power supply line is received, primary power supply conversion is carried out on the power supply, 12V voltage is obtained and used for supplying power to the slave PLC carrier communication circuit, meanwhile, secondary power supply conversion is carried out on the 12V voltage, 3.3V voltage is obtained and used for supplying power to the slave PLC carrier communication circuit, the slave control circuit and the slave RS422 interface circuit.
When the slave node terminal serves as a relay communication node, the slave PLC carrier communication circuit transfers the carrier data transmitted from the master node terminal to the slave PLC carrier communication circuit of the corresponding slave node terminal via the 28V dc power supply line.
The communication rate of data transmission between the slave control circuit and the slave PLC carrier communication circuit is up to 3 Mbps.
The slave control circuit adopts an STM32F103CBT6 chip and designs three communication interfaces, namely an external debugging interface and two UART interfaces; the STM32F103CBT6 chip adopts a Cortex-M3 ARM inner core, and the dominant frequency is 72 MHz; the external debugging interface is connected to an external connector of a product, so that the program upgrading and debugging functions of the slave node terminal are realized; the UART1 is connected to the slave RS422 interface circuit, and realizes the serial port communication function with the slave external equipment, and the maximum communication speed reaches 2.25 Mb/s; the UART2 is connected to the slave PLC carrier communication circuit to realize data transceiving function, and the maximum communication speed thereof reaches 4.5 Mb/s.
Each slave node terminal and the master node terminal communicate through a 28V direct current power supply line, when a communication broadband carrier signal is superposed on the 28V direct current power supply line, the communication broadband carrier signal needs to be set in order to reduce the influence on the power supply frequency of the 28V direct current power supply line, and the setting mode is as follows:
a) adjusting the working frequency bands of a main node terminal and a slave node terminal according to the frequency point distribution condition of each device of an electrical system on an aircraft, wherein the working frequency bands of the main node terminal and the slave node terminal are 700K-30 MHz;
b) adjusting the output signal power and signal gain of the main node terminal and the slave node terminal to enable the in-band emission power spectrum density to be adjustable within the range of-55 dB/Hz-35 dB/Hz, and ensuring the normal communication of the terminals on the premise of reducing the influence of terminal signals on other equipment;
c) the current generated by the terminal broadband carrier signal in the system is measured, and compared with the interference signal injection limit value specified in the CS114 test item in the GJB151B, if the current generated by the broadband carrier signal is smaller than the limit value, it can be shown that the broadband carrier signal in the system is smaller than the interference signal injection limit value specified by the CS114, and if other devices in the system pass the CS114 test, the other devices should be able to bear the influence of the broadband carrier signal, so as to evaluate the influence of the broadband carrier signal on the other devices.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention realizes the broadband carrier ad hoc network communication of the aircraft electrical system based on the 28V direct current power supply line for the first time, thereby reducing the complexity of a cable network and further reducing the weight and the volume of the aircraft. Meanwhile, when the communication terminal is used for communication, the aircraft electrical system can be compatible, and the normal work of other equipment of the aircraft electrical system is not influenced.
(2) Under the condition of no relay, the transmission distance of the invention can reach more than 2Km based on the 28V direct current power supply line, and the invention can meet the data mutual transmission requirement between any 28V power supply equipment and ground equipment in the aircraft.
(3) The invention has the characteristics of high speed, low error rate and low delay. The master PLC carrier communication circuit and the slave PLC carrier communication circuit adopt an OFDM modulation and demodulation mode, and the communication speed of effective data is up to more than 2 Mb/s; by setting the broadband carrier signal of communication, the low bit error rate is realized, the anti-jamming capability is strong, the aircraft 28V power supply network system is compatible, and the high-reliability data transmission is realized.
(4) The invention can realize the low-delay quick transparent transmission function of data between devices, can ensure that the delay of the PLC carrier communication circuit is less than 30ms by means of widening the working frequency range of the terminal, improving the serial port communication rate with external devices and the like, and meets the transparent transmission requirements of various protocols and various interfaces.
(5) The invention adopts a miniaturized modular design, is convenient to install and use, does not influence the normal work of other terminals when increasing or decreasing one terminal, and is flexible to install and use.
Drawings
FIG. 1 is a schematic diagram of a communication terminal according to the present invention;
FIG. 2 is a schematic diagram of a master control circuit or a slave control circuit;
fig. 3 is a schematic diagram of a master PLC carrier communication circuit;
FIG. 4 is a schematic diagram of a slave LC carrier communication circuit;
fig. 5 is a perspective view of a master PLC carrier communication circuit or a slave PLC carrier communication circuit.
Detailed Description
Aiming at the existing problems, the invention provides an aircraft electrical system communication terminal which realizes data communication based on a power line so as to reduce the complexity of a cable network.
The communication terminal comprises a main node terminal and a plurality of slave node terminals, wherein one electronic device is selected from an aircraft electronic system and is provided with the main node terminal, the other electronic devices are provided with the slave node terminals, the main node terminal and the slave node terminals can realize automatic networking, and a multi-level associated tree structure which takes the main node terminal as a center and is connected with all the slave node terminals in the same 28V power supply network is formed. Each slave node terminal and master node terminal performs information forwarding transmission through a 28V dc power supply line. Each slave node terminal can be used as a relay communication contact, and when the communication environment of the slave node terminal is severe and difficult to directly carry out networking communication with the master node terminal, the relay networking communication with the master node terminal can be realized through other slave node terminals. Electronic equipment in the aircraft electrical system can realize interconnection and intercommunication through the main node terminal and the slave node terminal after networking.
Specifically, as shown in fig. 1, the master node terminal includes a master control circuit, a master PLC carrier communication circuit, a master RS422 interface circuit, and a master power supply circuit.
A main control circuit: determining a networking white list, and sending a networking instruction to a main PLC carrier communication circuit; controlling the communication frequency band and the transmitting signal gain of the PLC, and simultaneously sending the communication frequency band of the slave node terminal to the main PLC carrier communication circuit; after networking, receiving the carrier data of the slave node terminal sent by the master PLC carrier communication circuit, judging whether the carrier data is sent to the master node terminal, if so, sending the carrier data to master external equipment connected with the master node terminal through a master RS422 interface circuit; receiving the information of the main external equipment forwarded by the main RS422 interface circuit, converting the information into carrier data and sending the carrier data to the main PLC carrier communication circuit;
main PLC carrier communication circuit: is connected with a 28V direct current power supply line; sending the networking instruction to a slave node terminal in a networking white list through a 28V direct current power supply line; transmitting the communication frequency band of the slave node terminal to the slave node terminal through a 28V direct current power supply line; after networking, receiving carrier data sent by the slave node terminal through a 28V direct current power supply line, and sending the carrier data to the main control circuit; if the carrier data is to be sent to other slave node terminals, sending the carrier data to the corresponding slave node terminals through a 28V direct current power supply line; according to the requirement, the carrier data from the main control circuit is sent to the corresponding slave node terminal through a 28V direct current power supply line;
main RS422 interface circuit: the carrier data transmission circuit is connected with the main external equipment, forwards information sent by the main external equipment to the main control circuit and sends the carrier data received by the main control circuit to the main external equipment;
a main power supply circuit: and receiving power supply of a 28V direct current power supply line, performing primary power supply conversion on the power supply line to obtain 12V voltage to supply power to the main PLC carrier communication circuit, and performing secondary power supply conversion on the 12V voltage to obtain 3.3V voltage to supply power to the main PLC carrier communication circuit, the main control circuit and the main RS422 interface circuit.
The communication rate of data transmission between the main control circuit and the main PLC carrier communication circuit can reach 3Mbps at most.
The main control circuit adopts an STM32F103CBT6 chip and designs three communication interfaces, namely an external debugging interface and two UART interfaces; the STM32F103CBT6 chip adopts a Cortex-M3 ARM inner core, and the dominant frequency is 72 MHz; the external debugging interface is connected to the external connector of the product, so that the program upgrading and debugging functions of the main node terminal are realized; the UART1 is connected to the main RS422 interface circuit to realize the serial port communication function with the main external equipment, and the maximum communication speed reaches 2.25 Mb/s; the UART2 is connected to the main PLC carrier communication circuit to realize data transceiving function, and the maximum communication speed reaches 4.5 Mb/s.
The slave node terminal comprises a slave control circuit, a slave PLC carrier communication circuit, a slave RS422 interface circuit and a slave power supply circuit;
slave PLC carrier communication circuit: is connected with a 28V direct current power supply line; receiving a networking instruction through a 28V direct current power supply line to realize network access; receiving the communication frequency band and the information carrier data of the main external equipment sent by the main node terminal through a 28V direct current power supply line, and forwarding the data to a slave control circuit; sending the information carrier data of the slave external equipment to a main node terminal through a 28V direct current power supply line;
the slave control circuit: receiving a communication frequency band sent by a main node terminal, and adjusting the communication frequency band to the communication frequency band sent by the main node terminal; receiving information carrier data of the master external equipment sent by the master node terminal, and forwarding the information carrier data to the slave external equipment connected with the slave node terminal through a slave RS422 interface circuit; receiving the information of the slave external equipment forwarded by the RS422 interface circuit, converting the information into carrier data and sending the carrier data to the slave PLC carrier communication circuit;
from the RS422 interface circuitry: the slave control circuit is connected with the slave external device, forwards the information sent from the external device to the slave control circuit and sends the carrier data received from the control circuit to the slave external device;
from the power supply circuit: the power supply of the 28V direct current power supply line is received, primary power supply conversion is carried out on the power supply, 12V voltage is obtained and used for supplying power to the slave PLC carrier communication circuit, meanwhile, secondary power supply conversion is carried out on the 12V voltage, 3.3V voltage is obtained and used for supplying power to the slave PLC carrier communication circuit, the slave control circuit and the slave RS422 interface circuit.
When the slave node terminal serves as a relay communication node, the slave PLC carrier communication circuit transfers the carrier data transmitted from the master node terminal to the slave PLC carrier communication circuit of the corresponding slave node terminal via the 28V dc power supply line.
The communication rate of data transmission between the slave control circuit and the slave PLC carrier communication circuit is up to 3 Mbps.
As shown in fig. 2, the master control circuit in the master node terminal and the slave control circuit in the slave node terminal have the same structure, and both use STM32F103CBT6 chips to design three communication interfaces, namely, an external debug interface and two UART interfaces; the STM32F103CBT6 chip adopts a Cortex-M3 ARM core, the dominant frequency is 72MHz, the chip has 48 pins in total, the size is small, and the computing and interface resources are rich; the external debugging interface is connected to the product external-to-external connector, so that the program upgrading and debugging functions of the corresponding terminal are realized;
the UART1 of the main control circuit is connected to the main RS422 interface circuit to realize the serial port communication function with the main external equipment, and the maximum communication speed reaches 2.25 Mb/s; the UART2 is connected to the main PLC carrier communication circuit to realize data transceiving function, and the maximum communication speed reaches 4.5 Mb/s.
The UART1 of the slave control circuit is connected to the slave RS422 interface circuit to realize the serial port communication function with the slave external equipment, and the maximum communication speed reaches 2.25 Mb/s; the UART2 is connected to the slave PLC carrier communication circuit to realize data transceiving function, and the maximum communication speed thereof reaches 4.5 Mb/s.
As shown in fig. 3, the main PLC carrier communication circuit includes a crystal oscillator, a PSRAM, a PLC chip (HZ3001), an analog front end chip (PA1450), and a signal conditioning and coupling circuit.
The HZ3001 chip integrates two 32-bit RISC-V kernel CPUs, is internally provided with a PLC MAC, a PLC PHY based on OFDM modulation and demodulation, an Analog Front End (AFE) and various peripheral interfaces (such as UART, SPI, I2C and the like), performs amplification processing through an external analog front-end chip PA1450, and is provided with a PSRAM chip to expand the running memory capacity of the chip.
The signal conditioning circuit mainly completes functions of PLC signal filtering, coupling, surge suppression and the like.
As shown in fig. 4, the slave PLC carrier communication circuit includes a crystal oscillator, a PLC chip (HZ3011), and a signal conditioning and coupling circuit. The external analog front-end chip PA1450 and PSRAM chip are not equipped.
The three-dimensional structure of the master PLC carrier communication circuit and the slave PLC carrier communication circuit is shown in fig. 5, and the size is 70mm (length) × 63mm (width) × 28mm (height).
The technical indexes of the master node terminal and the slave node terminal of the present invention are shown in table 1:
TABLE 1 main technical indexes of terminal
Serial number Index name Specific index
1 Rate of communication >1Mb/s
2 Topological structure Bus structure
3 Modulation system PLC broadband carrier
4 Coding method OFDM
5 Communication distance Greater than 200 m
6 Supply voltage 28V±4V
7 Supply current <0.15A
8 Weight (D) <0.15kg
The terminal of the invention needs to be bound with the appointed external equipment and appoints the ID of the terminal, and the data transmission between the equipment needs to appoint the ID number of the other party.
When the master external device needs to send data to a certain slave external device 2, the control circuit of the master node terminal firstly analyzes and identifies a data frame sent by the master external device through the master RS422 interface circuit, then packages the data frame as a data segment into a data frame format (the data frame contains the MAC address of the slave external device 2) identified by the master PLC carrier communication circuit and sends the data frame format to the master PLC carrier communication circuit, the master PLC carrier communication circuit sends the packaged data to the 28V dc power supply line, the slave PLC carrier communication circuit of the slave node terminal corresponding to the slave external device receives the data matched with its own ID and sends the data to the slave control circuit, and the slave control circuit extracts the data segment data and finally forwards the data to the slave external device to complete the data transparent transmission function.
The invention can also remove the master control circuit and the slave control circuit according to the requirement, and directly use the master PLC carrier communication circuit or the slave PLC carrier communication circuit to be connected with the RS422 interface circuit, thereby further reducing the communication delay.
The invention realizes the broadband carrier ad hoc network communication of the aircraft electrical system based on the 28V direct current power supply line for the first time, thereby reducing the complexity of a cable network and further reducing the weight and the volume of the aircraft. Meanwhile, when the communication terminal is used for communication, the aircraft electrical system can be compatible, and the normal work of other equipment of the aircraft electrical system is not influenced.
Those skilled in the art will appreciate that the invention has not been described in detail in this specification.

Claims (10)

1.一种飞行器电气系统通信终端,其特征在于:包括一个主节点终端和多个从节点终端,在飞行器电子系统中选择一个电子设备安装主节点终端,在其余电子设备上安装从节点终端,主节点终端和从节点终端能够实现自动组网,每个从节点终端和主节点终端通过28V直流供电线进行通信。1. an aircraft electrical system communication terminal is characterized in that: comprise a master node terminal and a plurality of slave node terminals, select an electronic device in the aircraft electronic system to install the master node terminal, and install slave node terminals on the remaining electronic devices, The master node terminal and the slave node terminal can realize automatic networking, and each slave node terminal and the master node terminal communicate through a 28V DC power supply line. 2.根据权利要求1所述的一种飞行器电气系统通信终端,其特征在于:每个从节点终端均能作为中继通信接点,实现远距离从节点终端与主节点终端的通信。2 . The aircraft electrical system communication terminal according to claim 1 , wherein each slave node terminal can be used as a relay communication contact to realize the communication between the remote slave node terminal and the master node terminal. 3 . 3.根据权利要求1所述的一种飞行器电气系统通信终端,其特征在于:主节点终端包括主控制电路、主PLC载波通信电路、主RS422接口电路及主电源电路;3. The communication terminal of an aircraft electrical system according to claim 1, wherein the main node terminal comprises a main control circuit, a main PLC carrier communication circuit, a main RS422 interface circuit and a main power supply circuit; 主控制电路:确定组网白名单,向主PLC载波通信电路发送组网指令;控制自身的通信频段和发射信号增益,同时向主PLC载波通信电路发送从节点终端的通信频段;组网后,接收主PLC载波通信电路发送的从节点终端载波数据,判断该载波数据是否是发送给主节点终端的,若是,则通过主RS422接口电路发送给主节点终端连接的主外部设备;接收主RS422接口电路转发的主外部设备信息,将其转化为载波数据,发送给主PLC载波通信电路;Main control circuit: Determine the networking whitelist, send networking instructions to the main PLC carrier communication circuit; control its own communication frequency band and transmit signal gain, and send the communication frequency band of the slave node terminal to the main PLC carrier communication circuit; after networking, Receive the slave node terminal carrier data sent by the main PLC carrier communication circuit, and judge whether the carrier data is sent to the master node terminal; if so, send it to the main external device connected to the master node terminal through the main RS422 interface circuit; The main external device information forwarded by the circuit is converted into carrier data and sent to the main PLC carrier communication circuit; 主PLC载波通信电路:与28V直流供电线连接;将组网指令通过28V直流供电线发送给组网白名单中的从节点终端;将从节点终端的通信频段通过28V直流供电线发送给从节点终端;组网后,通过28V直流供电线接收从节点终端发送的载波数据,发送给主控制电路;若该载波数据要发送给其他从节点终端,则通过28V直流供电线发送给相应的从节点终端;根据需求,将来自主控制电路的载波数据通过28V直流供电线发送给对应的从节点终端;Main PLC carrier communication circuit: connect with the 28V DC power supply line; send the networking command to the slave node terminal in the networking whitelist through the 28V DC power supply line; send the communication frequency band of the slave node terminal to the slave node through the 28V DC power supply line Terminal; after networking, the carrier data sent from the node terminal is received through the 28V DC power supply line, and sent to the main control circuit; if the carrier data is to be sent to other slave node terminals, it is sent to the corresponding slave node through the 28V DC power supply line Terminal; according to requirements, the carrier data from the main control circuit is sent to the corresponding slave node terminal through the 28V DC power supply line; 主RS422接口电路:与主外部设备连接,将主外部设备发送的信息转发给主控制电路,并将主控制电路接收的载波数据发送给主外部设备;Main RS422 interface circuit: connect with the main external equipment, forward the information sent by the main external equipment to the main control circuit, and send the carrier data received by the main control circuit to the main external equipment; 主电源电路:接收28V直流供电线的供电,将其进行一次电源转换,得到12V电压,为主PLC载波通信电路供电,同时将12V电压进行二次电源转换,获得3.3V电压,为主PLC载波通信电路、主控制电路和主RS422接口电路供电。Main power supply circuit: Receive the power supply of the 28V DC power supply line, perform a power conversion on it, obtain a 12V voltage, and supply power for the main PLC carrier communication circuit, and convert the 12V voltage for a secondary power supply to obtain a 3.3V voltage, which is the main PLC carrier The communication circuit, the main control circuit and the main RS422 interface circuit are powered. 4.根据权利要求3所述的一种飞行器电气系统通信终端,其特征在于:主控制电路与主PLC载波通信电路之间数据传输的通信速率最高达3Mbps。4 . The aircraft electrical system communication terminal according to claim 3 , wherein the communication rate of data transmission between the main control circuit and the main PLC carrier communication circuit is up to 3 Mbps. 5 . 5.根据权利要求3所述的一种飞行器电气系统通信终端,其特征在于:主控制电路采用STM32F103CBT6芯片,设计三个通信接口,即对外调试接口及两个UART接口;其中STM32F103CBT6芯片采用Cortex-M3 ARM内核,主频为72MHz;对外调试接口连接至产品对外接插件上,实现主节点终端的程序升级及调试功能;UART1连接至主RS422接口电路,实现与主外部设备的串口通信功能,其最大通信速率达2.25Mb/s;UART2连接至主PLC载波通信电路,实现数据收发功能,其最大通信速率达4.5Mb/s。5. a kind of aircraft electrical system communication terminal according to claim 3, is characterized in that: main control circuit adopts STM32F103CBT6 chip, designs three communication interfaces, namely external debugging interface and two UART interfaces; Wherein STM32F103CBT6 chip adopts Cortex- M3 ARM core, the main frequency is 72MHz; the external debugging interface is connected to the external plug-in of the product to realize the program upgrade and debugging function of the main node terminal; UART1 is connected to the main RS422 interface circuit to realize the serial communication function with the main external device. The maximum communication rate is 2.25Mb/s; UART2 is connected to the main PLC carrier communication circuit to realize the function of data transmission and reception, and its maximum communication rate is 4.5Mb/s. 6.根据权利要求1所述的一种飞行器电气系统通信终端,其特征在于:从节点终端包括从控制电路、从PLC载波通信电路、从RS422接口电路及从电源电路;6. The communication terminal of an aircraft electrical system according to claim 1, wherein the slave node terminal comprises a slave control circuit, a slave PLC carrier communication circuit, a slave RS422 interface circuit and a slave power supply circuit; 从PLC载波通信电路:与28V直流供电线连接;通过28V直流供电线接收组网指令,实现入网;通过28V直流供电线接收主节点终端发送的通信频段、主外部设备信息载波数据,转发给从控制电路;将从外部设备信息载波数据通过28V直流供电线发送给主节点终端;Slave PLC carrier communication circuit: connect with the 28V DC power supply line; receive networking instructions through the 28V DC power supply line to achieve network access; receive the communication frequency band and main external device information carrier data sent by the master node terminal through the 28V DC power supply line, and forward it to the slave Control circuit; send the information carrier data from the external equipment to the main node terminal through the 28V DC power supply line; 从控制电路:接收主节点终端发送的通信频段,并将自身通信频段调至主节点终端发送的通信频段;接收主节点终端发送的主外部设备信息载波数据,经从RS422接口电路转发给该从节点终端连接的从外部设备;接收从RS422接口电路转发的从外部设备信息,将其转化为载波数据发送给从PLC载波通信电路;Slave control circuit: Receive the communication frequency band sent by the master node terminal, and adjust its own communication frequency band to the communication frequency band sent by the master node terminal; The slave external device connected to the node terminal; receives the slave external device information forwarded from the RS422 interface circuit, converts it into carrier data and sends it to the slave PLC carrier communication circuit; 从RS422接口电路:与从外部设备相连,将从外部设备发送的信息转发给从控制电路,并将从控制电路接收的载波数据发送给从外部设备;Slave RS422 interface circuit: connected to the slave external device, forwards the information sent from the external device to the slave control circuit, and sends the carrier data received from the control circuit to the slave external device; 从电源电路:接收28V直流供电线的供电,将其进行一次电源转换,得到12V电压,为从PLC载波通信电路供电,同时将12V电压进行二次电源转换,获得3.3V电压,为从PLC载波通信电路、从控制电路和从RS422接口电路供电。From the power supply circuit: Receive the power supply of the 28V DC power supply line, perform a power conversion on it, and obtain a 12V voltage, which is the power supply for the slave PLC carrier communication circuit, and at the same time convert the 12V voltage for a secondary power supply to obtain a 3.3V voltage for the slave PLC carrier wave. The communication circuit, the slave control circuit and the slave RS422 interface circuit are powered. 7.根据权利要求6所述的一种飞行器电气系统通信终端,其特征在于:当从节点终端作为中继通信节点时,从PLC载波通信电路将主节点终端发送的载波数据通过28V直流供电线转发给相应从节点终端的从PLC载波通信电路。7. The communication terminal of an aircraft electrical system according to claim 6, wherein when the slave node terminal is used as a relay communication node, the carrier data sent by the master node terminal is passed through the 28V DC power supply line from the PLC carrier communication circuit. Forwarded to the slave PLC carrier communication circuit of the corresponding slave node terminal. 8.根据权利要求6所述的一种飞行器电气系统通信终端,其特征在于:从控制电路与从PLC载波通信电路之间数据传输的通信数率最高达3Mbps。8 . The aircraft electrical system communication terminal according to claim 6 , wherein the communication rate of data transmission between the slave control circuit and the slave PLC carrier communication circuit is up to 3 Mbps. 9 . 9.根据权利要求6所述的一种飞行器电气系统通信终端,其特征在于:从控制电路采用STM32F103CBT6芯片,设计三个通信接口,即对外调试接口及两个UART接口;其中STM32F103CBT6芯片采用Cortex-M3 ARM内核,主频为72MHz;对外调试接口连接至产品对外接插件上,实现从节点终端的程序升级及调试功能;UART1连接至从RS422接口电路,实现与从外部设备的串口通信功能,其最大通信速率达2.25Mb/s;UART2连接至从PLC载波通信电路,实现数据收发功能,其最大通信速率达4.5Mb/s。9. A kind of aircraft electrical system communication terminal according to claim 6, it is characterized in that: adopt STM32F103CBT6 chip from control circuit, design three communication interfaces, namely external debugging interface and two UART interfaces; Wherein STM32F103CBT6 chip adopts Cortex- M3 ARM core, the main frequency is 72MHz; the external debugging interface is connected to the external plug-in of the product to realize the program upgrade and debugging function of the slave node terminal; UART1 is connected to the slave RS422 interface circuit to realize the serial communication function with the external device. The maximum communication rate is 2.25Mb/s; UART2 is connected to the slave PLC carrier communication circuit to realize the function of data transmission and reception, and its maximum communication rate is 4.5Mb/s. 10.根据权利要求1所述的一种飞行器电气系统通信终端,其特征在于:每个从节点终端和主节点终端通过28V直流供电线进行通信,通信的宽带载波信号叠加到28V直流供电线时,为了降低对28V直流供电线供电频率的影响,需对通信的宽带载波信号进行设置,设置方式如下:10. An aircraft electrical system communication terminal according to claim 1, wherein each slave node terminal and the master node terminal communicate through a 28V DC power supply line, and when the broadband carrier signal of the communication is superimposed on the 28V DC power supply line , in order to reduce the influence on the power supply frequency of the 28V DC power supply line, it is necessary to set the broadband carrier signal of the communication. The setting method is as follows: a)根据飞行器上电气系统各设备的频点分布情况,调整主节点终端和从节点终端的工作频段,所述主节点终端和从节点终端的工作频段为700K-30MHz;a) According to the frequency distribution of each equipment in the electrical system on the aircraft, adjust the working frequency bands of the master node terminal and the slave node terminal, and the working frequency band of the master node terminal and the slave node terminal is 700K-30MHz; b)调整主节点终端和从节点终端的输出信号功率和信号增益使得带内发射功率谱密度在-55dB/Hz—-35dB/Hz范围内可调,在降低终端信号对其他设备影响的前提下,保证终端正常通信;b) Adjust the output signal power and signal gain of the master node terminal and the slave node terminal so that the in-band transmit power spectral density is adjustable within the range of -55dB/Hz—-35dB/Hz, under the premise of reducing the impact of the terminal signal on other devices , to ensure the normal communication of the terminal; c)测量终端宽带载波信号在系统中产生的电流,将其与GJB151B中CS114测试项目中规定的干扰信号注入限值进行比较,若宽带载波信号产生的电流小于限值,则能够说明在系统中宽带载波信号小于CS114规定的注入干扰信号限值,若系统中其他设备通过了CS114试验,则其应能承受宽带载波信号影响,以此评估宽带载波信号对其他设备的影响。c) Measure the current generated by the terminal broadband carrier signal in the system, and compare it with the interference signal injection limit specified in the CS114 test item in GJB151B. If the current generated by the broadband carrier signal is less than the limit, it can indicate that the The wideband carrier signal is less than the limit of the injected interference signal specified by CS114. If other equipment in the system passes the CS114 test, it should be able to withstand the influence of the wideband carrier signal, so as to evaluate the impact of the wideband carrier signal on other equipment.
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